Plastic
Power
SEMICONDUCTOR
TECHNICAL DATA
MEDIUM CURRENT
THREE–TERMINAL
ADJUSTABLE POSITIVE
VOLTAGE REGULATOR
ORDERING INFORMATION
Order this document by LM317M/D
DT SUFFIX
PLASTIC PACKAGE
CASE 369A
(DPAK)
DT–1 SUFFIX
PLASTIC PACKAGE
CASE 369
(DPAK)
T SUFFIX
PLASTIC PACKAGE
CASE 221A
(All 3 Packages)
Pin 1. Adjust
2. Vout
3. Vin
Heatsink surface
connected to Pin 2
123
123
13
Plastic
Power
LM317MBT#
LM317MABT# TJ = –40° to +125°C
Device Operating
Temperature Range Package
LM317MT
LM317MAT TJ = 0° to +125°C
# Automotive temperature range selections are
#available with special test conditions and additional
#tests. Contact your local Motorola sales office for
#information.
LM317MDT
LM317MADT
LM317MDT–1
LM317MADT–1
TJ = 0° to 125°CDPAK
Heatsink Surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
LM317MBDT
LM317MABDT
LM317MBDT–1
LM317MABDT–1
TJ = –40° to 125°CDPAK
1
MOTOROLA ANALOG IC DEVICE DATA
The LM317M is an adjustable three–terminal positive voltage regulator
capable of supplying in excess of 500 mA over an output voltage range of
1.2 V to 37 V . This voltage regulator is exceptionally easy to use and requires
only two external resistors to set the output voltage. Further, it employs
internal current limiting, thermal shutdown and safe area compensation,
making it essentially blow–out proof.
The LM317M serves a wide variety of applications including local,
on–card regulation. This device also makes an especially simple adjustable
switching regulator, a programmable output regulator, or by connecting a
fixed resistor between the adjustment and output, the LM317M can be used
as a precision current regulator.
•Output Current in Excess of 500 mA
•Output Adjustable between 1.2 V and 37 V
•Internal Thermal Overload Protection
•Internal Short Circuit Current Limiting
•Output Transistor Safe–Area Compensation
•Floating Operation for High Voltage Applications
•Eliminates Stocking Many Fixed Voltages
Motorola, Inc. 1998 Rev4
Simplified Application
* = Cin is required if regulator is located an appreciable distance from power supply filter.
** = CO is not needed for stability, however, it does improve transient response.
Since IAdj is controlled to less than 100
µ
A, the error associated with this
term is negligible in most applications.
LM317M
Vin Vout
R1
240
R2
Adjust
IAdj
*
Cin
0.1
µ
F
**
+CO
1.0
µ
F
Vin Vout
Vout
+
1.25 V
ǒ
1
)
R2
R1
Ǔ)
IAdj R2
LM317M, LM317MA
2MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.)
Rating Symbol Value Unit
Input–Output V oltage Dif ferential VI–VO40 Vdc
Power Dissipation (Package Limitation) (Note 1)
Plastic Package, T Suffix
TA = 25°C
Thermal Resistance, Junction–to–Air
Thermal Resistance, Junction–to–Case
Plastic Package, DT Suffix
TA = 25°C
Thermal Resistance, Junction–to–Air
Thermal Resistance, Junction–to–Case
PD
θJA
θJC
PD
θJA
θJC
Internally Limited
70
5.0
Internally Limited
92
5.0
°C/W
°C/W
°C/W
°C/W
Operating Junction Temperature Range TJ–40 to +125 °C
Storage Temperature Range Tstg –65 to +150 °C
NOTE: 1. Figure 23 provides thermal resistance versus pc board pad size.
ELECTRICAL CHARACTERISTICS (VI–VO = 5.0 V; IO = 0.1 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
Characteristics Figure Symbol Min Typ Max Unit
Line Regulation (Note 2)
TA = 25°C, 3.0 V ≤ VI–VO ≤ 40 V 1Regline –0.01 0.04 %/V
Load Regulation (Note 2)
TA = 25°C, 10 mA ≤ IO ≤ 0.5 A
VO ≤ 5.0 V
VO ≥ 5.0 V
2 Regload
–
–5.0
0.1 25
0.5 mV
% VO
Adjustment Pin Current 3 IAdj –50 100 µA
Adjustment Pin Current Change
2.5 V ≤ VI–VO ≤ 40 V, 10 mA ≤ IL ≤ 0.5 A, PD ≤ Pmax 1,2 ∆IAdj –0.2 5.0 µA
Reference Voltage LM317M:
3.0 V ≤VI–VO ≤ 40 V, 10 mA ≤ IO ≤ 0.5 A, PD ≤ Pmax LM317MA: 3 Vref 1.200
1.225 1.250
1.250 1.300
1.275 V
Line Regulation (Note 2)
3.0 V ≤VI–VO ≤ 40 V 1Regline –0.02 0.07 %/V
Load Regulation (Note 2)
10 mA ≤IO ≤0.5 A
VO ≤5.0 V
VO ≥ 5.0 V
2 Regload
–
–20
0.3 70
1.5 mV
% VO
Temperature Stability (Tlow ≤TJ ≤Thigh) 3 TS–0.7 – % VO
Minimum Load Current to Maintain Regulation
(VI–VO = 40 V) 3 ILmin –3.5 10 mA
Maximum Output Current
VI–VO ≤ 15 V, PD ≤ Pmax
VI–VO = 40 V, PD ≤Pmax, TA = 25°C
3 Imax 0.5
0.15 0.9
0.25 –
–
A
RMS Noise, % of VO
TA= 25°C, 10 Hz ≤f ≤10 kHz – N – 0.003 – % VO
Ripple Rejection, VO = 10 V, f = 120 Hz (Note 3)
Without CAdj
CAdj = 10 µF
4RR –
66 65
80 –
–
dB
Long–Term Stability, TJ = Thigh (Note 4)
TA= 25°C for Endpoint Measurements 3 S – 0.3 1.0 %/1.0 k
Hrs.
NOTES: 1.Tlow to Thigh = 0° to +125°C for LM317M Tlow to Thigh = –40° to +125°C for LM317MB
2.Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately.
Pulse testing with low duty cycle is used.
3.CAdj, when used, is connected between the adjustment pin and ground.
4.Since Long–Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability
from lot to lot.
LM317M, LM317MA
3
MOTOROLA ANALOG IC DEVICE DATA
Representative Schematic Diagram
18k
6.8V
6.8V
350
300 300 300 3.0k 300 70
200k
1.2560
50
130 8.67k 500
400
2.4k
12.8k
Vout
5.1k
6.3V 2.0k 6.0k
Adjust
Vin
180 180 10
pF 10
pF
* Pulse Testing Required:
1% Duty Cycle is suggested.
Line Regulation (%/V) = VOH – VOL x 100
*
VCC
VIHVIL Vin Vout VOH
VOL
RL
+1.0
µ
FCO
240
1%
R1
Adjust
R2
1%
Cin 0.1
µ
F
LM317M
IAdj
Figure 1. Line Regulation and ∆IAdj/Line Test Circuit
VOL
LM317M, LM317MA
4MOTOROLA ANALOG IC DEVICE DATA
* Pulse Testing Required:
1% Duty Cycle is suggested.
Load Regulation (mV) = VO (min Load) –VO (max Load)
Load Regulation (% VO) = VO (min Load) – VO (max Load) X 100 VO (min Load)
VO (max Load)
LM317M
Cin 0.1
µ
F
Adjust
R2
1%
CO1.0
µ
F
+*
RL
(max Load) RL
(min Load)
Vout
R1240
1%
Vin Vin
IAdj
IL
Figure 2. Load Regulation and ∆IAdj/Load Test Circuit
VO (min Load)
*Pulse Testing Required:
1% Duty Cycle is suggested.
LM317M
Vin Vout
Adjust R1240
1% +1
µ
FCO
RL
Cin
R2
1%
To Calculate R2:
Vout = ISET R2 + 1.250 V
Assume ISET = 5.25 mA
IL
IAdj
ISET
Vref
VO
VI
0.1
µ
F
Figure 3. Standard Test Circuit
LM317M
Vin Vout Vout = 10 V
RL
Cin 0.1
µ
F
Adjust R1240
1%
D1 *
1N4002
CO+1.0
µ
F
24V
14V
R21.65K
1% CAdj 10
µ
F
+
*D
1
Discharges CAdj if Output is Shorted to Ground.
**CAdj provides an AC ground to the adjust pin.
f = 120 Hz
VO
**
Figure 4. Ripple Rejection Test Circuit
LM317M, LM317MA
5
MOTOROLA ANALOG IC DEVICE DATA
Iout, OUTPUT CURRENT (A)
IB, QUIESCENT CURRENT (mA)
Vin–Vout, INPUT–OUTPUT VOLT AGE
DIFFERENTIAL (V)
Figure 5. Load Regulation Figure 6. Ripple Rejection
Figure 7. Current Limit Figure 8. Dropout Voltage
Figure 9. Minimum Operating Current Figure 10. Ripple Rejection versus Frequency
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0 –50 –25 0 25 50 75 100 125 150
∆
Vout
TJ, JUNCTION TEMPERATURE (
°
C)
, OUTPUT VOLTAGE CHANGE (%)
Vin = 45 V
Vout = 5.0 V
IL = 5.0 mA to 40 mA
Vin = 10 V
Vout = 5.0 V
IL = 5.0 mA to 100 mA
80
70
60
50
RR, RIPPLE REJECTION (dB)
–50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (
°
C)
IL = 100 mA
f = 120 Hz
Vout = 10 V
Vin = 14 V to 24 V
–50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (
°
C)
2.5
2.0
1.5
1.0
0.5
IL = 500 mA
1.0
0.80
0.60
0.40
0.20
00 1020304050
V
in–Vout, INPUT–OUTPUT VOL TAGE DIFFERENTIAL (V)
TJ = 25
°
C
TJ = 125
°
C
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0 10203040
V
in–Vout, INPUT–OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
100
90
80
70
60
50
40
30
20
10
10 100 1.0 k 10 k 100 k 1.0 M
f, FREQUENCY (Hz)
RR, RIPPLE REJECTION (dB)
IL = 40 mA
Vin = 5.0 V
±
1.0 VPP
Vout = 1.25 V
90
Without CAdj = 10
µ
F
Without CAdj
IL = 100 mA
TJ = 25
°
C
TJ = 125
°
C
LM317M, LM317MA
6MOTOROLA ANALOG IC DEVICE DATA
Vout, OUTPUT VOLTAGE
∆
DEVIATION (V)
Vout, OUTPUT VOLTAGE
∆
DEVIATION (V)
Vin, INPUT VOLTAGE
∆
CHANGE (V) Vout, OUTPUT VOLTAGE CHANGE (%)
∆
IAdj, ADJUSTMENT PIN CURRENT ( A)
µ
ref
V , REFERENCE VOLTAGE (V)
CL = 0.3
µ
F; CAdj = 10
µ
F
Figure 11. Temperature Stability Figure 12. Adjustment Pin Current
Figure 13. Line Regulation Figure 14. Output Noise
Figure 15. Line Transient Response
0 10203040
t, TIME (
µ
s)
CL = 1.0
µ
F
CL = 0
Vin
Vout = 10 V
IL = 50 mA
TJ = 25
°
C
010203040
t, TIME (
µ
s)
I
CURRENT (A)
L, LOAD
CL = 1.0
µ
F; CAdj = 10
µ
F
Vin = 15 V
Vout = 10 V
INL = 50 mA
TJ = 25
°
C
IL
–50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (
°
C)
Vin = 4.2 V
Vout = Vref
IL = 5.0 mA
–50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (
°
C)
Vin = 6.25 V
Vout = Vref
IL = 10 mA
IL = 100 mA
–50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (
°
C)
Vin = 4.25 V to 41.25 V
Vout = Vref
IL = 5.0 mA
–50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (
°
C)
Bandwidth 100 Hz to 10 kHz
Figure 16. Load Transient Response
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
1.0
0.5
0
3.0
2.0
1.0
0
–1.0
–2.0
–3.0
1.5
1.0
0.5
0
1.260
1.250
1.240
1.230
1.220
80
70
65
60
55
50
45
40
35
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
10
8.0
6.0
4.0
NOISE VOLTAGE ( V)
µ
LM317M, LM317MA
7
MOTOROLA ANALOG IC DEVICE DATA
APPLICATIONS INFORMATION
Basic Circuit Operation
The LM317M is a three–terminal floating regulator. In
operation, the LM317M develops and maintains a nominal
1.25 V reference (Vref) between its output and adjustment
terminals. This reference voltage is converted to a
programming current (IPROG) by R1 (see Figure 17), and this
constant current flows through R2 to ground. The regulated
output voltage is given by:
Vout
+
Vref
ǒ
1
)
R2
R1
Ǔ)
IAdj R2
Since the current from the terminal (IAdj) represents an
error term in the equation, the LM317M was designed to
control IAdj to less than 100 µA and keep it constant. To do
this, all quiescent operating current is returned to the output
terminal. This imposes the requirement for a minimum load
current. If the load current is less than this minimum, the
output voltage will rise.
Since the LM317M is a floating regulator, it is only the
voltage differential across the circuit which is important to
performance, and operation at high voltages with respect to
ground is possible.
+
Vref
Adjust
Vin Vout
LM317M
R1
IPROGVout
R2
IAdj
Vref = 1.25 V Typical
Figure 17. Basic Circuit Configuration
Load Regulation
The LM317M is capable of providing extremely good load
regulation, but a few precautions are needed to obtain
maximum performance. For best performance, the
programming resistor (R1) should be connected as close to
the regulator as possible to minimize line drops which
effectively appear in series with the reference, thereby
degrading regulation. The ground end of R2 can be returned
near the load ground to provide remote ground sensing and
improve load regulation.
External Capacitors
A 0.1 µF disc or 1.0 µF tantalum input bypass capacitor
(Cin) is recommended to reduce the sensitivity to input line
impedance.
The adjustment terminal may be bypassed to ground to
improve ripple rejection. This capacitor (CAdj) prevents ripple
from being amplified as the output voltage is increased. A
10 µF capacitor should improve ripple rejection about 15 dB
at 120 Hz in a 10 V application.
Although the LM317M is stable with no output
capacitance, like any feedback circuit, certain values of
external capacitance can cause excessive ringing. An output
capacitance (CO) in the form of a 1.0 µF tantalum or 25 µF
aluminum electrolytic capacitor on the output swamps this
effect and insures stability.
Protection Diodes
When external capacitors are used with any IC regulator it
is sometimes necessary to add protection diodes to prevent
the capacitors from discharging through low current points
into the regulator.
Figure 18 shows the LM317M with the recommended
protection diodes for output voltages in excess of 25 V or high
capacitance values (CO > 25 µF, CAdj > 5.0 µF). Diode D1
prevents CO from discharging thru the IC during an input
short circuit. Diode D2 protects against capacitor CAdj
discharging through the IC during an output short circuit. The
combination of diodes D1 and D2 prevents CAdj from
discharging through the IC during an input short circuit.
D1
Vin
Cin
1N4002
LM317M Vout
R1+CO
D2
R2CAdj
1N4002
Adjust
Vout
Figure 18. Voltage Regulator with
Protection Diodes
LM317M, LM317MA
8MOTOROLA ANALOG IC DEVICE DATA
Figure 19. Adjustable Current Limiter Figure 20. 5 V Electronic Shutdown Regulator
Figure 21. Slow Turn–On Regulator Figure 22. Current Regulator
Vref
+25V
Vin LM317M Vout R1VO
1.25k
Adjust
IO
D2
1N914
1N5314
R2
500
* To provide current limiting of IO
to the system ground, the source of
the current limiting diode must be tied to
a negative voltage below – 7.25 V.
R2
≥
Vref
R1 = VSS*
D1
1N914
VO < POV + 1.25 V + VSS
ILmin – IP < IO < 500 mA – IP
As shown O < IO < 495 mA
+10
µ
F
Vin Vout
240 1N4001
LM317M
Adjust
MPS2907
R2
50k
Vin
D1
1N4002 Vout
120
Adjust
720
+1.0
µ
F
MPS2222
1.0k TTL
Control
LM317M
Minimum Vout = 1.25 V
D1 protects the device during an input short circuit.
LM317M
Vin R1R2
Adjust IAdj
Iout
5.0 mA < Iout < 100 mA
Vout
Ioutmax = Vref + IAdj
^
1.25 V
R1 + R2
Vout
Vout
Vin
IDSS
IOmax + IDSS
R1 + R2
40
50
60
70
80
90
100
0
0.4
0.8
1.2
1.6
2.0
2.4
010203025155.0
L, LENGTH OF COPPER (mm)
PD(max) for TA = 50
°
C
Minimum
Size Pad
PD
L
L
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
, MAXIMUM POWER DISSIPATION (W)
Free Air
Mounted
Vertically
R
θ
JA
2.0 oz. Copper
R , THERMAL RESISTANCE
JA
θ
JUNCTION–T O–AIR ( C/W)
°
Figure 23. DPAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
LM317M, LM317MA
9
MOTOROLA ANALOG IC DEVICE DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A–06
ISSUE Y
DT–1 SUFFIX
PLASTIC PACKAGE
CASE 369–07
(DPAK)
ISSUE K
OUTLINE DIMENSIONS
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION Z DEFINES A ZONE WHERE ALL
BODY AND LEAD IRREGULARITIES ARE
ALLOWED.
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.570 0.620 14.48 15.75
B0.380 0.405 9.66 10.28
C0.160 0.190 4.07 4.82
D0.025 0.035 0.64 0.88
F0.142 0.147 3.61 3.73
G0.095 0.105 2.42 2.66
H0.110 0.155 2.80 3.93
J0.018 0.025 0.46 0.64
K0.500 0.562 12.70 14.27
L0.045 0.060 1.15 1.52
N0.190 0.210 4.83 5.33
Q0.100 0.120 2.54 3.04
R0.080 0.110 2.04 2.79
S0.045 0.055 1.15 1.39
T0.235 0.255 5.97 6.47
U0.000 0.050 0.00 1.27
V0.045 ––– 1.15 –––
Z––– 0.080 ––– 2.04
B
Q
H
Z
L
V
G
N
A
K
F
123
4
D
SEATING
PLANE
–T–
C
S
T
U
R
J
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
123
4
V
S
A
K
–T–
SEATING
PLANE
R
B
F
GD3 PL
M
0.13 (0.005) T
C
E
JH
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.235 0.250 5.97 6.35
B0.250 0.265 6.35 6.73
C0.086 0.094 2.19 2.38
D0.027 0.035 0.69 0.88
E0.033 0.040 0.84 1.01
F0.037 0.047 0.94 1.19
G0.090 BSC 2.29 BSC
H0.034 0.040 0.87 1.01
J0.018 0.023 0.46 0.58
K0.350 0.380 8.89 9.65
R0.175 0.215 4.45 5.46
S0.050 0.090 1.27 2.28
V0.030 0.050 0.77 1.27
LM317M, LM317MA
10 MOTOROLA ANALOG IC DEVICE DATA
DT SUFFIX
PLASTIC PACKAGE
CASE 369A–13
(DPAK)
ISSUE Y
OUTLINE DIMENSIONS
D
A
K
B
R
V
S
FL
G
2 PL
M
0.13 (0.005) T
E
C
U
J
H
–T–
SEATING
PLANE
Z
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.235 0.250 5.97 6.35
B0.250 0.265 6.35 6.73
C0.086 0.094 2.19 2.38
D0.027 0.035 0.69 0.88
E0.033 0.040 0.84 1.01
F0.037 0.047 0.94 1.19
G0.180 BSC 4.58 BSC
H0.034 0.040 0.87 1.01
J0.018 0.023 0.46 0.58
K0.102 0.114 2.60 2.89
L0.090 BSC 2.29 BSC
R0.175 0.215 4.45 5.46
S0.020 0.050 0.51 1.27
U0.020 ––– 0.51 –––
V0.030 0.050 0.77 1.27
Z0.138 ––– 3.51 –––
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
123
4
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
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arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
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Opportunity/Af firmative Action Employer .
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LM317M/D
◊
